CS_Source Code.py

"""to maintain student details 
roll number
name 
percentage
""" 
""" 
modules imported 
""" 
import pickle 
import os
import time
""" 
class used 
"""
class student(object):
    def __int__(s): 
        s.roll=0 
        s.name="" 
        s.per=0 
    def add_rec(s): 
        s.roll=int(input("Enter roll number: ")) 
        s.name=input("Enter name: ") 
        s.name=s.name.upper() 
        s.per=float(input("Enter percentage: ")) 
    def disp_rec(s): 
        print("roll number: ",s.roll) 
        print("name: ",s.name) 
        print("percentage: ",s.per) 
    def display_rec(s): 
        print("%-10s"%s.roll,"%-20s"%s.name,"%-10s"%s.per) 
        #print("in display_rec") 
    def modify_rec(s): 
        s.roll=int(input("Enter new roll number: ")) 
        s.name=input("Enter new name: ") 
        s.name=s.name.upper()
        s.per=float(input("Enter new percentage: "))
def write_record(): 
    try: 
        rec=student() 
        file=open("stud.dat","ab") 
        rec.add_rec() 
        pickle.dump(rec,file) 
        file.close() 
        print("Record added in file!") 
        input("Press any key to continue....") 
    except: 
        pass 
def display_all():  
    print(40*"=") 
    print("\n\t    Student Records\n") 
    print(40*"=") 
    try: 
        file=open("stud.dat","rb") 
        while True: 
            rec=pickle.load(file) 
            rec.display_rec() 
    except EOFError: 
        file.close() 
        print(40*"=") 
        input("Press any key to continue....") 
    except IOError: 
        print("File could not be opened!!") 
def search_roll(): 
    try: 
        z=0 
        print(40*"=") 
        print("Record searching by roll number...") 
        print(40*"=") 
        n=int(input("Enter roll number to search: ")) 
        file=open("stud.dat","rb") 
        while True: 
            rec=pickle.load(file) 
            #print(rec.roll) 
            if(rec.roll==n): 
                z=1 
                print("\nRecord found and details are:\n") 
                rec.disp_rec() 
                break 
    except EOFError: 
        file.close() 
        if(z==0): 
            print("Record is not present!!") 
    except IOError: 
        print("File could not be opened!!") 
    input("Press any key to continue....") 
def search_name(): 
    try: 
        z=0
        print(40*"=") 
        print("Record searching by name...") 
        print(40*"=")
        n=input("Enter name to search: ") 
        file=open("stud.dat","rb") 
        while True: 
            rec=pickle.load(file) 
            #print(rec.roll) 
            if(rec.name==n.upper()): 
                z=1
                print("\nRecord found and details are:\n")
                rec.disp_rec() 
                break 
    except EOFError:
        file.close() 
        if(z==0): 
            print("Record is not present!!") 
    except IOError: 
        print("File could not be opened!!")
    input("Press any key to continue....") 
def modify_roll():  
    z=0 
    try: 
        n=int(input("Enter roll number to modify: ")) 
        file=open("stud.dat","rb") 
        temp=open("temp.dat","wb") 
        while True: 
            rec=pickle.load(file) 
            if(rec.roll==n): 
                z=1 
                print("\nRecord found and details are:\n") 
                rec.disp_rec() 
                print("\nEnter new data...") 
                rec.modify_rec() 
                pickle.dump(rec,temp) 
                print("Record updated!") 
            else: 
                pickle.dump(rec,temp)
    except EOFError: 
        file.close() 
        temp.close() 
        if(z==0): 
            print("Record not found!!") 
    except IOError: 
        print("File could not be opened!!") 
    os.remove("stud.dat") 
    os.rename("temp.dat","stud.dat") 
    input("Press any key to continue....") 
def delete_roll(): 
    z=0 
    try: 
        n=int(input("Enter roll number to delete: ")) 
        file=open("stud.dat","rb") 
        temp=open("temp.dat","wb") 
        while True: 
            rec=pickle.load(file) 
            if(rec.roll==n): 
                z=1 
                print("\nRecord to delete found and details are:\n") 
                rec.disp_rec() 
                #pickle.dump(rec,temp) 
                print("Record updated!") 
            else: 
                pickle.dump(rec,temp) 
    except EOFError: 
        file.close() 
        temp.close() 
        if(z==0): 
            print("Record not found!!") 
    except IOError: 
        print("File could not be opened!!") 
    os.remove("stud.dat") 
    os.rename("temp.dat","stud.dat") 
    input("Press any key to continue....") 
while True: 
    os.system("cls")
    print(40*"=") 
    print("""              Main Menu 
              --------- 
        1. Add record 
        2. Display all records 
        3. Search by roll number 
        4. Search by name 
        5. Modify by roll number 
        6. Delete by roll number 
        7. Exit 
    """) 
    print(40*"=") 
    ch=int(input("Enter your choice: ")) 
    print(40*"=") 
    if(ch==1): 
        write_record() 
    elif(ch==2): 
        display_all() 
    elif(ch==3): 
        search_roll() 
    elif(ch==4): 
        search_name() 
    elif(ch==5): 
        modify_roll() 
    elif(ch==6): 
        delete_roll() 
    elif(ch==7): 
        print("\n\t      !!!End!!!\n")
        time.sleep(2)
        break
    else: 
        print("Invalid choice!!")
        time.sleep(1)